Update cheatsheets

tldr/img2sixel

@@ -0,0 +1,17 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# img2sixel
+
+> Convert images to the Sixel format for displaying in a terminal.
+> More information: <https://manned.org/img2sixel>.
+
+- Display an image in the terminal:
+
+`img2sixel {{path/to/image}}`
+
+- Resize the image to the specified width and height before displaying it:
+
+`img2sixel {{-w|--width}} {{number}} {{-h|--height}} {{number}} {{path/to/image}}`